clockworklabs/SpacetimeDB · error

Failed to serialize procedure result

Error message

Failed to serialize procedure result

What it means

Error "Failed to serialize procedure result" thrown in clockworklabs/SpacetimeDB.

Source

Thrown at crates/bindings/src/rt.rs:233

    fn into_result(self) -> Result<(), Box<str>> {
        Ok(self)
    }
}
impl<E: fmt::Display> IntoReducerResult for Result<(), E> {
    #[inline]
    fn into_result(self) -> Result<(), Box<str>> {
        self.map_err(|e| e.to_string().into())
    }
}

#[diagnostic::on_unimplemented(
    message = "The procedure return type `{Self}` does not implement `SpacetimeType`",
    note = "if you own the type, try adding `#[derive(SpacetimeType)]` to its definition"
)]
pub trait IntoProcedureResult: SpacetimeType + Serialize {
    #[inline]
    fn to_result(&self) -> ProcedureResult {
        bsatn::to_vec(&self).expect("Failed to serialize procedure result")
    }
}
impl<T: SpacetimeType + Serialize> IntoProcedureResult for T {}

#[diagnostic::on_unimplemented(
    message = "the first argument of a reducer must be `&ReducerContext`",
    label = "first argument must be `&ReducerContext`"
)]
pub trait ReducerContextArg {
    // a little hack used in the macro to make error messages nicer. it generates <T as ReducerContextArg>::_ITEM
    #[doc(hidden)]
    const _ITEM: () = ();
}
impl ReducerContextArg for &ReducerContext {}

/// A trait of types that can be an argument of a reducer.
#[diagnostic::on_unimplemented(
    message = "the reducer argument `{Self}` does not implement `SpacetimeType`",

View on GitHub (pinned to 524b4487d9)

When it happens

Trigger: Thrown at crates/bindings/src/rt.rs:233 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of clockworklabs/SpacetimeDB@524b4487d9 (2026-08-16). Data as JSON: /api/errors/b17523b959fc2cdb. Report an issue: GitHub.